APA (7th ed.) Citation

Barber, Metcalfe, & Porteous. (1989). Barriers to growth in small firms. Routledge.

Chicago Style (17th ed.) Citation

Barber, Metcalfe, and Porteous. Barriers to Growth in Small Firms. London: Routledge, 1989.

MLA (9th ed.) Citation

Barber, et al. Barriers to Growth in Small Firms. Routledge, 1989.